OpenIndiana Distribution

When pasted into an interactive bash shell in a remote tty (ssh/putty) on OI151a7, the attached script generates a
"-bash: echo: write error: Interrupted system call"
event when the window is resized.

Function A simply outputs zero (in hex); function B fills a data file with garbage and then loops infinitely reads the data file one line at a time, passing the line to a shell that reads it, calls A and then outputs 0 to /dev/null using printf. Calling function B and then resizing the terminal window (i.e sending a SIGWINCH signal to the process) causes the "Interrupted system call".

Removing almost any element of the script causes the behaviour to change, suggesting a race condition (which might mean that it may not occur on all systems).

Blocking SIGWINCH events using trap "" 20 inhibits the behaviour.

This is a cut-down version of a real script that exhibited this behaviour, reduced to the point just before the behaviour stops occuring.